He hasn't put his thumb on the scale for any one candidate in particular. But in two different speeches this month, he has made clear that presidential hopefuls would be wise to avoid moving too far to the left if they hope to win back the White House in 2020.
Some party strategists and operatives say that by throwing the weight of his legacy and influence into the simmering ideological debate between the Democratic Party's progressive and moderate wings, the former president has the potential to reshape the dynamics of the primary race.
His latest remarks came last week as Obama met with party donors in California, where he urged Democrats to "chill out" about the primary contest and prepare to rally behind the eventual nominee. But he also appeared to warn against calling for too drastic of change.
"When you listen to the average voter - even ones who aren't stalwart Democrats, but who are more independent or are low-information voters - they don't feel that things are working well, but they're also nervous about changes that might take away what little they have," Obama said.
For some Democrats, Obama's remarks reinforced their concerns that the primary field has lurched too far to the left and that the party may be barreling toward a loss in 2020 unless it can unite behind a moderate nominee capable of appealing to a broader swath of voters in the general election.
"I think that to some extent Obama is the canary in the coal mine," said Dick Harpootlian, a former chair of the South Carolina Democratic Party who is supporting former Vice President Joe Biden's presidential bid.
"He's warning Democrats that if you buy an agenda that is not relevant or salable in November, you're guaranteeing Donald Trump a second term."
Hope for the best, that the party listens to Obama's warnings, or PREPARE for another Trump victory followed by MORE ultra conservative judicial appointments.
THINK ABOUT IT!
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